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SAT prep help

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Set M consists of the consecutive integers from -15 to y, inclusive. If the sum of all the integers in set M is 70, How many numbers are in the set?

  • SAT prep help - ,

    a. 33
    b. 34
    c. 35
    d. 36
    e. 37

  • SAT prep help - ,

    -15 to +15 includes 31 integers, counting zero. The sum is zero.
    so 16+17+18+19=70 (ie, 17.5 x 4).

    so I count 31+5 integers.

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